JP2002325402A - Method and device for manufacturing laminated iron core - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and device for manufacturing laminated iron core, by which the product performance of a laminated iron core can be stabilized by improving the flatness of punched iron core plates having external core back sections which are weakened by openings, such as slots, etc., by preventing deformation of the core back sections. SOLUTION: In the method, the laminated iron core is manufactured by obtaining iron core plates with reinforcing members, by fitting easily removable reinforcing members 16 for the core back sections to the openings 13 of the punched iron core plates 11, having the weakened external core back sections 15; after the iron core plates with the reinforcing members have been blanked and laminated upon another, the reinforcing members 16 are removed; and the device for manufacturing the laminated iron core is constituted of a cut and carry die, with which the method can be performed easily.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for manufacturing a laminated iron core used for a rotor or a stator of a rotating machine, and more particularly to a punched iron core plate in which a core back portion on the outer side is fragile by an opening such as a slot. On the other hand, the present invention relates to a method and an apparatus for manufacturing a laminated iron core, in which deformation of the core back portion is prevented, flatness is improved and product performance is stabilized.

[0002]

2. Description of the Related Art A laminated iron core of a rotating machine of this type includes, for example, a stator core plate 1 having a closed slot shape (a slot does not communicate with the outer shape) shown in FIG. The stator core plate 2 and the like having a shape (communicated with the outer shape) are manufactured by punching using a progressive die and then laminating a predetermined number of sheets.

[0003] In the progressive die, after punching out the shaft holes 3 and 4 and the slots 5 and 6, the outer shape is punched, and the radially protruding tee-score portions (polar portions) 7 and 8 are placed on the tip side.
Iron plate 1 for stator forming separated core back portion 9
Alternatively, the stator core plates 2 forming the continuous core back portion 10 are sequentially dropped into a lamination die, and a predetermined number of laminations are integrated by caulking or laser welding in a laminated state.

In the production of such a laminated iron core for a rotating machine,
Due to the frictional resistance between the punch and the die generated when the outer shape is punched and the frictional resistance between the die and the inner peripheral surface generated when the die is stacked in the die, the stator core plates 1 and 2 are formed on the outer peripheral edges of the core back portions 9 and 10. Since the portion is deformed as shown in FIG. 1B or FIG. 2B and the flatness is reduced, when the product is laminated as it is to produce a product, the product performance is reduced or the product performance varies. Will be.

[0005] As means for solving these problems, once the outer shape is punched, the hole is returned to the outer shape punched hole (pushed back). There is a push-back method in which the state is locked and held and the next step is to drop it into the die.

[0006] As another means, after partially punching a part of the outer shape (fragile portion of the core back portion) first, and then punching the remaining outer shape, the outer shape punching does not affect the fragile portion. A two-stage punching method was also adopted.

[0007]

However, in the former push-back method, the structure of the progressive die is complicated, the number of processes is increased, the punching speed cannot be increased, and the push-back iron core plate is not used. Therefore, when the outer shape is punched and laminated, a uniform lamination state cannot be obtained, and the product performance may be reduced.

Further, in the latter two-stage punching method, punching including the outside is performed by a punch inscribed in the outer shape for performing partial punching. Therefore, a strip-shaped iron core plate having a width corresponding to the punching is required. In this respect, the yield deteriorates, and the progressive die becomes large and uneconomical due to the partial punching punch arranged outside the outer shape.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a method and an apparatus for manufacturing a laminated iron core capable of solving the problems of the prior art, and in particular, a punched iron core plate having a core back portion which is fragile on the outer peripheral side by an opening such as a slot. On the other hand, the deformation of the core back portion was prevented, the flatness was improved, and the product performance was stabilized.

[0010]

A method of manufacturing a laminated core according to the present invention is directed to a method of manufacturing a laminated core in which a core plate is punched and laminated by a progressive die, wherein a core back portion on an outer shape side is fragile due to an opening. For the punched iron core plate, the reinforcing member of the core back part that is easy to remove is attached to the opening, and after the core plate with this reinforcing member is punched out and laminated,
The purpose is to remove the reinforcing member.

According to this method of manufacturing a laminated iron core, since the fragile core back portion is reinforced by the reinforcing member, when the outer shape of the iron core plate is punched and laminated, the core plate receives frictional resistance from a punch or a die. However, the deformation can be prevented, the flatness can be maintained, the product performance can be stabilized, and the reinforcing member can be easily removed after lamination to form the original opening.

In this method of manufacturing a laminated iron core, it is possible to adopt a form in which a reinforcing member for temporarily joining the inner peripheral side and the core back portion is fitted into the opening, whereby the core back portion is reinforced and formed. It is possible to easily and inexpensively remove the reinforcing member.

When the method for manufacturing a laminated iron core is applied to a core plate for a stator of a rotating machine, a bridging piece is radially extended in a manner as a reinforcing member in a slot, which is an opening, as a reinforcing member. It can be applied to both the closed slot shape and the open slot shape, and is particularly effective for a closed slot shape core plate having a narrow core back portion. is there.

Further, the bridging piece is formed by punching a split slot on both sides while leaving a separation band at the center, then punching the separation band in a half-punched state, and pushing back into a punched hole by flat pressing. And can be achieved without greatly changing the configuration of the conventional progressive die.

Next, the apparatus for manufacturing a laminated iron core according to the present invention is characterized in that a punching core plate in which a core back portion on the outer side is fragile by an opening is provided in a progressive die for punching and laminating an iron core plate to produce a laminated iron core. On the other hand, a first punching means for punching an opening while leaving a reinforcing part, a second punching means for punching a reinforcing part in a half-punched state, and a reinforcement which is easy to remove by returning a reinforcing part to a punching hole Pushback means as a member is provided.

According to the laminated iron core manufacturing apparatus, unlike the pushback method in the prior art in which the outer shape punching is returned to the punched hole, a part of the opening is pushed back as a reinforcing portion, so that the structure of the progressive die is complicated. And the punching speed is not reduced even if the number of steps is increased, and the retaining and retaining of the reinforcing portion does not adversely affect the outer shape punching and lamination.

Further, unlike the conventional two-stage punching method for the outer shape, it is not necessary to punch out the outer portion of the outer shape, so that the yield of material removal is not deteriorated and the progressive die is formed by the arrangement of the punches. Is not enlarged.

When this manufacturing apparatus for a laminated core is applied to the manufacture of a stator core plate for a rotating machine, a slot which is an opening is divided into a slot on both sides in a state where a separation band is left in the center as a reinforcing portion. A first punching means for punching the separation band, a second punching means for punching the separation band in a half-punched state, and a push-back means for returning the separation band to the punching hole and forming a reinforcing member which can be easily removed. Can take the form.

According to the apparatus for manufacturing a laminated iron core, a simple structure such as a punch and a die is partially added to the slot forming means in the conventional progressive die.
In a state where the fragile core back portion is prevented from being deformed, it is possible to punch and stack the outer shape of the stator core plate having a high flatness.

In the apparatus for manufacturing a laminated iron core, a punching switching unit is provided in the second punching means, and the punching switching unit positions the punching punch of the second punching means at a half-punching height or a height at which the punching punch is completely punched. It is possible to adopt a form of switching control to the position, and it is possible to selectively attach the reinforcing members to all the iron core plates, or to attach the reinforcing members for every desired number of sheets.

Further, as means for achieving the same object,
A third punching means and a punch switching unit are provided between the first punching means and the second punching means, and the punching switching unit moves the punching punch of the third punching means to a height at which the reinforcing portion is completely punched. It is also possible to adopt a mode in which switching control is performed to a height position or a height position where punching is not performed.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a method and an apparatus for manufacturing a laminated iron core according to the present invention will be described in detail with reference to the accompanying drawings showing a preferred embodiment, and FIGS. The first to fourth embodiments applied to an iron core plate are shown,
7 shows a progressive die for punching a stator core plate, FIG. 8 shows a main part of the progressive die of FIG. 7, and FIG. 9 shows a punching process of the stator core plate.

The stator core plate 11 shown in FIGS. 3 to 6 is provided with a large number of slots 13 opening at predetermined angles as openings on the outer peripheral side of a shaft hole 12 provided at the center. A tee score portion (polar portion) 14 is formed on the outer periphery of the slot 13, and an annular core back portion 15 integrated with the tee score portion 14 is provided.

Each slot 1 is provided in the stator core plate 11.
A bridging piece 16 is fitted and locked as a reinforcing member at a substantially central part in the inside 3, and the core back part 15 is reinforced by connecting the inner circumferential side and the outer circumferential side of the slot 13 with the bridging piece 16. And adopt a configuration to prevent deformation at the time of punching the outer shape,
In order to easily remove the bridging piece 16 later, in a progressive die punching step, the bridge piece 16 is once half-punched or completely punched and then pushed back into the slot 13 to be temporarily fixed.

FIGS. 3 and 4 show the stator core plates 11A and 11B having a closed slot. In the stator core plate 11A according to the first embodiment, each slot 13A is provided.
Protrusions 17 and 18 are provided on the inner and outer peripheral surfaces of each of these, and the bridging strip 16A is fitted and locked between the protruding parts 17 and 18. In the stator core plate 11B according to the second embodiment, the inside and outside of each slot 13 are provided. Concave portions 19 and 20 are provided on the peripheral surface, and
It is fitted and locked between 9 and 20.

FIGS. 5 and 6 show the stator core plates 11C and 11D having open slots.
The outer end side of 16D is the gap 2 of the separated core back portion 15.
1 and the inner end side of the bridging piece 16C is
The protrusion 17 provided on the inner peripheral surface of each slot 13 and the bridging piece 1
The inner end side of 6D is fitted and locked with a concave portion 19 provided on the inner peripheral surface of each slot 13, respectively.
At 16D, a reinforcing rib 22 abutting on the inner peripheral surface of the core back portion 15 is projected.

These stator core plates 11A to 11D
Are punched out by a progressive die, and sequentially dropped into a die.Then, a predetermined number of sheets are stacked and integrated by caulking, laser welding, etc., and after taking out from the progressive die, Bridging strip 16
A to 16D are removed by punching to produce a laminated core.

Next, a manufacturing process using a progressive die for manufacturing the stator core plate 11 will be described with reference to FIGS.
The progressive die 23 includes an upper die 24 and a lower die 25.
Each step (A) using the punch on the side and the die on the side of the lower mold 25
In (f), punching of the laminated core is performed.

Each step is a pilot hole punching step (a)
A shaft hole punching step (b), a slot punching step (c), a separation band punching step (d), a bridging piece pushback step (e), and an outer shape punching and laminating step (f).
Steps (a), (b) and (f) are the same steps as in the prior art, and steps (c), (d) and (e) are steps unique to the present invention.

That is, in the step (a), the iron core material 26
The punch hole 27 for intermittent conveyance is punched with a punch 28, and in the step (b), the shaft hole 12 is punched with a punch 29. In the step (f), the punch 3 is punched.
At 0, an outer shape punching process of pulling out the stator core plate 11 into the die and a work of laminating a predetermined number of the stator core plates 11 are performed.

In the step (c), according to the prior art, the entire slot 13 was punched, but it was divided into three parts in the circumferential direction, the middle part was divided by the separation band part 31, and only both sides were opened. Partial punching is performed in the state of the divided slots 13a, 13b, and the divided slots 13a, 13c
Is performed by a punch 32 (32a, 32b).

In the step (d), the separation band 31 is punched by a punch 33. This punching is performed in a half-punched state as shown in FIG.
Any one of a completely punched state as shown in FIG. 9C can be adopted, and a half-punched state or a completely punched state can be selectively performed by a punching switching unit as shown in FIG. Do.

The punching switching section 36 includes a punching punch 33,
A passage 37 is provided across the top side of the passage 33.
A cam member 38 for height adjustment is mounted in the inside so as to be horizontally movable, and the cam member 38 is brought into contact with the punch 33 at a low position and a first cam surface 38a for performing complete punching, at a high position. And a second cam surface 37b which is half-punched.
The first or second cam surface 3 is moved by moving the cam member 38 horizontally.
There is provided a cam driving means 39 such as a cylinder or a solenoid for selecting between 8a and 37b.

In the punching switching section 36, when the bridging strips 16 are provided for all the stator core plates 11, the state of the second cam surface 37b where the cam member 38 is half-punched is always set. In the case where the bridging strips 16 are provided every other or every predetermined number, the cam driving means 39 is controlled so as to switch to the first cam surface 38a or the second cam surface 37b in conformity with that.

In the step (e), the half-bridged bridging pieces 16 formed in the step (d) are formed on the separation band 31 by pressing the flat pressing punch 34 and the flat pressing die 35. The slot 13 is pushed back into the punching hole 40 and temporarily interposed between the divided slots 13a and 13c once communicated with each other. Sides are reinforced.

When the outer shape punching process is performed in the step (f), the core back portion 15 is pulled out with a narrow core back portion 15 formed on the outer peripheral side of the slot 13.
If 5 is fragile, it is deformed by the frictional resistance between the punch 30 and the die 41. However, the deformation is prevented by providing the bridging strip 16 and reinforcing it.

The work of laminating a predetermined number of the stator core plates 11 dropped into the die 41 using frictional engagement with the inner peripheral surface of the die 41 is performed. In addition, deformation is prevented by providing and reinforcing the bridging pieces 16.

Further, when the bridging strip 16 is punched from the laminated core taken out from the die 41 to form the slot 13 in which the divided slots 13a and 13c communicate with each other, the bridging strip 16 is temporarily fixed. Since it is in a state, it can be easily removed.

The progressive die 23 can take various modifications without being limited to the illustrated embodiment. For example, in the illustrated embodiment, depending on whether or not the bridging piece 16 is provided, the separation band portion is provided. In the punching step (d), the punching switching unit 36 is controlled to switch to a half-punching state or a complete punching state.
This can be divided into two steps.

For example, a pre-process for selectively performing whether or not the separation band portion 31 is completely punched and a post-process for forming the bridging pieces 16 by performing a half-punching punching process are divided into two processes. Then, using a configuration similar to that of the punching switching unit 36, switching control is performed between a punch punching height position and a punching non-punching height position.

During the punching process by the progressive die 23, it may be better to provide an idle process at a necessary location for reasons such as the balance of the die and the configuration of the die. Then, it is desirable to provide an idle step between the step (e) of pushing back the bridging piece 16 by, for example, flat pressing and the step (f) of punching and laminating the outer shape.

The punched stator core plates 11 are integrated by a temporary fixing means in a laminated state, and a known caulking connection or laser welding is used for the temporary fixing means. As a process for this, before the outer diameter punching, which is the final process, a punching process of a caulking projection for temporarily fixing the vertically adjacent core plates to each other, and a measurement for separating a predetermined number of laminated cores. Or a laser welding means in the final step.

[Brief description of the drawings]

FIG. 1 is a closed slot-shaped stator core plate to which the present invention is applied.
(B) shows a bb cross-sectional view, respectively.

FIG. 2 is an open slot-shaped stator core plate to which the present invention is applied, and (a) is a plan view of the whole;
(B) shows a bb cross-sectional view, respectively.

3A and 3B show a closed slot-shaped stator core plate according to a first embodiment to which the present invention is applied, wherein FIG. 3A is an overall plan view, and FIG. 3B is a bb cross-sectional view.

FIG. 4 is a closed slot-shaped stator core plate according to a second embodiment to which the present invention is applied, and shows an overall plan view.

FIG. 5 is an open-slot-shaped stator core plate according to a third embodiment to which the present invention is applied;

FIG. 6 is an open slot-shaped stator core plate according to a fourth embodiment to which the present invention is applied, and shows an overall plan view.

FIG. 7 is a schematic front view of an apparatus for manufacturing a laminated iron core using a progressive die to which the present invention is applied.

FIG. 8 is an explanatory view of a main part of the progressive die of FIG. 7;

FIG. 9 is a drawing showing a punching process using a progressive die to which the present invention is applied.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Core plate for stator 12 Shaft hole 13 Slot (opening) 14 Tee score part 15 Core back part 16 Bridge piece (Reinforcing member) 17, 18 Convex part 19, 20 Concave part 21 Gap part 22 Reinforcement rib 23 Progressive die 24 Upper die 25 Lower die 26 Iron core material 27 Pilot hole 28 Punching punch (for pilot hole) 29 Punching punch (for shaft hole) 30 Punching punch (for outer shape) 31 Separation band 32 Punching punch (for split slot) 33 Punching punch ( 34) Flat-punch punch 35 Flat-push die 36 Punch switching unit 37 Passage 38 Cam member 39 Cam driving means 40 Punch hole (for separation band) 41 Die (a) Pilot hole punching step (B) Shaft hole punch Process (c) Slot punching process (d) Separator strip punching process (e) Bridge pushback process (f)径打 punching and lamination process

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (Reference) H02K 1/18 H02K 1/18 B

Claims (8)

[Claims] 1. A method for manufacturing a laminated core in which a core plate is punched and laminated by a progressive die, wherein an opening is easily removed from a punched core plate in which a core back portion on an outer shape side is fragile by an opening. A method for manufacturing a laminated core, comprising: mounting a reinforcing member of a core back portion; punching and laminating an outer shape of an iron core plate with the reinforcing member; and removing the reinforcing member. 2. The method for manufacturing a laminated core according to claim 1, wherein a reinforcing member for temporarily joining an inner peripheral side and a core back portion is fitted into the opening. 3. The punched iron core plate is a core plate for a stator of a rotating machine, and a bridging piece is radially extended in a slot as the opening as the reinforcing member so as to cut off the inside of the slot. The method for manufacturing a laminated core according to claim 2. 4. The bridging piece is formed by punching a split slot on both sides while leaving a separation band in the center, then punching the separation band in a half-punched state, and pushing back into a punched hole by flat pressing. The method for manufacturing a laminated core according to claim 3. 5. A progressive die for punching and laminating an iron core plate to produce a laminated iron core, wherein an opening is formed on a punched iron core plate whose outer side has a fragile core back portion due to an opening while leaving a reinforcing portion. A first punching means for punching the reinforcing member, a second punching means for punching the reinforcing portion in a half-punched state, and a push-back means for returning the reinforcing portion to the punching hole and forming a reinforcing member which can be easily removed. A manufacturing device for laminated iron cores. 6. A first punching means for punching a slot which is an opening of a stator iron core plate of a rotating machine as a divided slot on both sides while leaving a separation band at the center as a reinforcing portion; 6. The laminated iron core according to claim 5, further comprising: the second punching means for punching the part in a half-punched state; and the push-back means for returning the separation band part to a punching hole to make the member easy to remove. manufacturing device. 7. A punching switching section is provided in the second punching means, and the punching switching section controls the punching of the second punching means to a half-punching height position or a full-punching height position. An apparatus for manufacturing a laminated iron core according to claim 5. 8. A third punching means and a punching switching section are provided between the first punching means and the second punching means, and the punching switching section replaces a punching punch of the third punching means.
The apparatus for manufacturing a laminated iron core according to claim 5, wherein switching control is performed to a height position where the reinforcing portion is completely punched or a height position where punching is not performed.